fix(library): apply UI skills fixes to LibrarySearchFilter

Commit notes

- Replace h-* w-* with size-* for square elements (upload btn, search btn, filter btn, clear btn, badge) - Replace transition-all with transition-[width] for explicit property animation - Reduce animation duration from 200ms to 150ms for snappier interaction - Remove will-change: width (was applied statically, wasting GPU memory) - Add tabular-nums to filter count badge for proper number alignment

Co-authored-by: armin.naimi <[email redacted]>